Let’s say that I am National Guard, ordered into a town to make arrests or put down “insurrection”. I don’t want to shoot civilians, and I feel very uncomfortable in my role, but I go.

Or let's say you're RA, and ordered to arrest mobilized Guard units and officers mustering at the (totally legal, totally constitutional) command of the governor of their State.

That's the Merriman scenario all over again, and it's also the Missouri Militia Volunteers, who were overreached in their own camp and ordered to surrender by a RA officer leading a whomped up force of regulars and Missouri Wide Awakes (think ACORN, think Sturmabteilungen, think New Black Panther Party). The Wide Awakes were secretly armed by the governor of Illinois illicitly, at the order of Abraham Lincoln, two months before he was sworn into office.